Figure 7.

Modeling of the UV-C dosage in different layers of the N95 mask including the effects of reflectivity. Local UV-C dosage is shown as a function of the position inside the four layers of the N95 mask. The three different curves show the local UV dosage for three cases of illumination: illumination from the inside only (orange), illumination from the outside only (green), and illumination from both sides (black) with 1000 mJ/cm² surface UV-C dosage. The dotted lines indicate the UV-C dosage necessary to achieve log-3 and log-6 level inactivation of SARS-CoV-2 using recently published data (77). To see this figure in color, go online.